# SPDX-License-Identifier: (GPL-2.0 OR BSD-2-Clause)
%YAML 1.2
---
$id:
http://devicetree.org/schemas/soc/qcom/qcom,saw2.yaml#
$schema:
http://devicetree.org/meta-schemas/core.yaml#
title: Qualcomm Subsystem Power Manager / SPM AVS Wrapper 2 (SAW2)
maintainers:
- Andy Gross <agross@kernel.org>
- Bjorn Andersson <bjorn.andersson@linaro.org>
description: |
The Qualcomm Subsystem Power Manager is used to control the peripheral logic
surrounding the application cores in Qualcomm platforms.
The SAW2 is a wrapper around the Subsystem Power Manager (SPM) and the
Adaptive Voltage Scaling (AVS) hardware. The SPM is a programmable
power-controller that transitions a piece of hardware (like a processor or
subsystem) into and out of low power modes via a direct connection to
the PMIC. It can also be wired up to interact with other processors in the
system, notifying them when a low power state is entered or exited.
properties:
compatible:
items:
- enum:
- qcom,ipq4019-saw2-cpu
- qcom,ipq4019-saw2-l2
- qcom,ipq8064-saw2-cpu
- qcom,sdm660-gold-saw2-v4.1-l2
- qcom,sdm660-silver-saw2-v4.1-l2
- qcom,msm8998-gold-saw2-v4.1-l2
- qcom,msm8998-silver-saw2-v4.1-l2
- qcom,msm8909-saw2-v3.0-cpu
- qcom,msm8916-saw2-v3.0-cpu
- qcom,msm8939-saw2-v3.0-cpu
- qcom,msm8226-saw2-v2.1-cpu
- qcom,msm8226-saw2-v2.1-l2
- qcom,msm8960-saw2-cpu
- qcom,msm8974-saw2-v2.1-cpu
- qcom,msm8974-saw2-v2.1-l2
- qcom,msm8976-gold-saw2-v2.3-l2
- qcom,msm8976-silver-saw2-v2.3-l2
- qcom,apq8084-saw2-v2.1-cpu
- qcom,apq8084-saw2-v2.1-l2
- qcom,apq8064-saw2-v1.1-cpu
- const: qcom,saw2
reg:
items:
- description: Base address and size of the SPM register region
- description: Base address and size of the alias register region
minItems: 1
regulator:
$ref: /schemas/regulator/regulator.yaml#
description: Indicates that this SPM device acts as a regulator device
device for the core (CPU or Cache) the SPM is attached to.
required:
- compatible
- reg
additionalProperties: false
examples:
- |
/* Example 1: SoC using SAW2 and kpss-acc-v2 CPUIdle */
cpus {
#address-cells = <1>;
#size-cells = <0>;
cpu@0 {
compatible = "arm,cortex-a53";
device_type = "cpu";
enable-method = "qcom,kpss-acc-v2";
qcom,acc = <&acc0>;
qcom,saw = <&saw0>;
reg = <0x0>;
operating-points-v2 = <&cpu_opp_table>;
};
};
saw0: power-manager@f9089000 {
compatible = "qcom,msm8974-saw2-v2.1-cpu", "qcom,saw2";
reg = <0xf9089000 0x1000>;
};
- |
/*
* Example 2: New-gen multi cluster SoC using SAW only for L2;
* This does not require any cpuidle driver, nor any cpu phandle.
*/
power-manager@17812000 {
compatible = "qcom,msm8998-gold-saw2-v4.1-l2", "qcom,saw2";
reg = <0x17812000 0x1000>;
};
power-manager@17912000 {
compatible = "qcom,msm8998-silver-saw2-v4.1-l2", "qcom,saw2";
reg = <0x17912000 0x1000>;
};
- |
/*
* Example 3: SAW2 with the bundled regulator definition.
*/
power-manager@2089000 {
compatible = "qcom,apq8064-saw2-v1.1-cpu", "qcom,saw2";
reg = <0x02089000 0x1000>, <0x02009000 0x1000>;
regulator {
regulator-min-microvolt = <850000>;
regulator-max-microvolt = <1300000>;
};
};
...
